Reindexing a Suffix

If your index files become corrupt, or if you
change the index for an attribute, you must reindex the suffix to recreate
the index files in the corresponding database directory. You can reindex a
suffix while the directory server is running or by reinitializing the suffix.

Reindexing a Suffix While the Directory Server Is
Running

When you reindex a suffix, the server examines all of the entries the
suffix contains and rebuilds the index files. During reindexing, the contents
of the suffix are read-only. Because the server must scan the entire suffix
for every attribute that is reindexed, this process might take up to several
hours for suffixes with millions of entries. The length of time also depends
on the indexes you configure. In addition, while the suffix is being reindexed,
it is not available.